Soft porous silicone rubbers with ultra-low sound speeds in acoustic metamaterials.

Soft porous silicone rubbers with ultra-low sound speeds in acoustic metamaterials.
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DOI:
10.1038/srep40106
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发表时间:
2017-01-05
期刊:
影响因子:
4.6
通讯作者:
Brunet T
Brunet T
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Ba A;Kovalenko A;Aristégui C;Mondain-Monval O;Brunet T

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Soft porous silicone rubbers are demonstrated to exhibit extremely low sound speeds of tens of m/s for these dense materials, even for low porosities of the order of a few percent. Our ultrasonic experiments show a sudden drop of the longitudinal sound speed with the porosity, while the transverse sound speed remains constant. For such porous elastomeric materials, we propose simple analytical expressions for these two sound speeds, derived in the framework of Kuster and Toksöz, revealing an excellent agreement between the theoretical predictions and the experimental results for both longitudinal and shear waves. Acoustic attenuation measurements also complete the characterization of these soft porous materials.
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